NET web api 利用NPOI 读取excel

安装NPOI

   [HttpPost("users/upload")]
    public async Task<IActionResult> Upload(IFormFile file)
    {

        if (file == null || file.Length == 0)
            return this.BadRequest("文件未来上传");
        var api_result = new List<string>();
        // 文件的处理逻辑
        using (var stream = new MemoryStream())
        {
            // 将文件复制到MemoryStream.
            await file.CopyToAsync(stream);

            // 使用MemoryStream来解析Excel文件.
            IWorkbook workbook;
            stream.Position = 0;
            workbook = new XSSFWorkbook(stream);

            ISheet sheet = workbook.GetSheetAt(0);
            for (int row = 0; row <= sheet.LastRowNum; row++)
            {
                if (sheet.GetRow(row) != null)
                {
                    //for (int column = 0; column < sheet.GetRow(row).LastCellNum; column++)
                    //{
                    //    // 用你的代码处理每一个单元格的数据
                    //    Console.WriteLine("Value of cell is: " + sheet.GetRow(row).GetCell(column));
                    //}
                    var value = sheet.GetRow(row).GetCell(0);
                    api_result.Add(value.ToString());
                }
            }
        }

        return this.Ok(api_result);
    }`